Connection to a fieldbus
6.3 Communication via PROFIBUS
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
105
6.3
Communication via PROFIBUS
Connect the frequency inverter to PROFIBUS
Inverters with PROFIBUS DP interface have a nine-pin SUB-D socket on the lower side of
the Control Unit to integrate the inverter into a PROFIBUS network.
The SUB D connection is suitable for the SIMATIC RS485 bus connector.
Recommended PROFIBUS connectors
We recommend one of the following connectors for the PROFIBUS cable:
1.
6GK1500-0FC00
2.
6GK1500-0EA02
Both connectors are suitable for all SINAMICS G120 Control Units with respect to the angle
of the outgoing cable.
Note
PROFIBUS communication when the 400 V supply for the inverter is switched off
If the inverter is only supplied via the 400 V line connection for the Power Module, the
PROFIBUS connection for the Control Unit is interrupted as soon as the power supply is
disconnected. To prevent this, the Control Unit must be connected to a separate 24 V power
supply via terminals 31 (+24 V I
n
) and 32 (0 V I
n
).
Permissible cable lengths, routing and shielding the PROFIBUS cable
Information can be found in the Internet
(
6.3.1
Configuring communication via PROFIBUS
6.3.1.1
Task
The inverter is to be controlled from a central SIMATIC controller via PROFIBUS. whereby
the control signals and speed setpoint are to be transferred from an S7-300 CPU to the
drive. In the other direction, the drive is to transfer its status messages and actual speed
value to the central controller via PROFIBUS.
Using a suitable example, the following section provides instructions explaining how to
connect an inverter to a higher-level SIMATIC controller via PROFIBUS. To extend the
PROFIBUS network to include additional inverters, simply repeat the relevant steps.